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Role of fasting duration and weekday in incretin and glucose regulation

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Fasting duration has been associated with lower fasting blood glucose levels, but higher 2-hour post-load levels, and research has indicated an adverse effect of 'weekend behavior' on human metabolism. We investigated associations of fasting duration and weekday of examination with glucose, insulin, glucagon and incretin responses to an oral glucose tolerance test (OGTT). This cross-sectional study is based on data from the ADDITION-PRO study, where 2082 individuals attended a health examination including an OGTT. Linear regression analysis was applied to study the associations of overnight fasting duration and day of the week with glucose, insulin, glucagon, glucose-dependent insulinotropic polypeptide (GIP), and glucagon-like peptide 1 (GLP-1) responses to an OGTT. We found that a one hour longer fasting duration was associated with 1.7% (95%CI:0.8,2.5) higher 2-hour glucose levels, as well as a 3.0% (95%CI:1.3,4.7) higher GIP and 2.3% (95%CI:0.3,4.4) higher GLP-1 response. Fasting insulin levels were 20.6% (95%CI:11.2,30.7) higher on Mondays compared to the other weekdays, with similar fasting glucose levels (1.7%, 95%CI:0.0,3.4). In this study longer overnight fasting duration was associated with a worsening of glucose tolerance and increased incretin response to oral glucose. We found higher fasting insulin levels on Mondays compared to the other days of the week, potentially indicating worsened glucose regulation after the weekend.

Original languageEnglish
JournalEndocrine Connections
Volume9
Issue number4
Pages (from-to)279
Number of pages288
ISSN2049-3614
DOIs
Publication statusPublished - 1 Apr 2020

    Research areas

  • Fasting duration, Incretin, Metabolism, Oral glucose tolerance test, Weekday

ID: 59534144